Re: [PATCH] Fix mpage_writepage() for pages with buffers

[Andrew Morton]

On Fri, 6 Oct 2017 14:15:41 -0700 Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote:

> When using FAT on a block device which supports rw_page, we can hit
> BUG_ON(!PageLocked(page)) in try_to_free_buffers().  This is because we
> call clean_buffers() after unlocking the page we've written.  Introduce a
> new clean_page_buffers() which cleans all buffers associated with a page
> and call it from within bdev_write_page().

This is all pretty mature code (isn't it?).  Any idea why this bug
popped up now?